Blacklist non-working Proxies #36
Description
A feature should be added to the proxy module that blacklists non-functioning proxies.
A proxy is considered non-functioning if the network connection can't be established or if the HTTP status code 407 Proxy Authentication Require is present.
Non-functioning proxies should be stored in a file called <scriptname>.badproxy in the format of one proxy URL per line. This follows the naming convention of the cache file.